EP1032518A1 - Elektromechanisches bremssystem - Google Patents
Elektromechanisches bremssystemInfo
- Publication number
- EP1032518A1 EP1032518A1 EP98965683A EP98965683A EP1032518A1 EP 1032518 A1 EP1032518 A1 EP 1032518A1 EP 98965683 A EP98965683 A EP 98965683A EP 98965683 A EP98965683 A EP 98965683A EP 1032518 A1 EP1032518 A1 EP 1032518A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- brake
- module
- pedal
- brake system
- setpoint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 22
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000007596 consolidation process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 230000002950 deficient Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
- B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/321—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration deceleration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/88—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
- B60T8/885—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means using electrical circuitry
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/40—Failsafe aspects of brake control systems
- B60T2270/413—Plausibility monitoring, cross check, redundancy
Definitions
- the invention relates to an electromechanical brake system and a method for controlling an electromechanical brake system which, through the use of a redundant bus system and redundant or error-detecting modules, increase system security while at the same time being implemented inexpensively.
- ABS anti-lock braking system
- ASR traction control or traction control
- ESP Electronic Stability Program
- the automatic brake intervention as can be provided for example in proximity control systems.
- This so-called electronic brake system has a central module and brake modules assigned to the brake circuits or wheel groups.
- the central module can Carrying out ABS and ASR calculations can set the brake force distribution and determine wheel-specific brake pressure setpoints.
- an electromechanical brake system in particular for motor vehicles, can be provided, which can have a pedal module for the redundant detection of driver actuation of a brake pedal by means of a suitable sensor system.
- the brake system can furthermore have a device for determining a brake setpoint based on the driver's request, and a brake module can be provided for controlling at least one wheel brake based on the brake setpoint.
- a data transmission unit can be provided, which is designed redundantly and establishes a data connection between the pedal module, the device and the brake module, wherein the device can have an error detection circuit which can detect an error in the determination of the brake setpoint.
- the brake module can be designed as a circuit module, and power electronics for controlling two actuators can be contained in the circuit module. Actuator-specific function software (eg a clamping force control) for two actuators can be implemented in each circuit module.
- the modules can be connected via a double data bus or the data transmission unit.
- the architecture of the braking system is essentially characterized by the signal and redundancy interfaces of the modules, which e.g. are fault-tolerant, fail-silent or fail-safe. The architecture therefore places particular emphasis on the division of functions for error detection by the modules themselves.
- a central module function can also be implemented in a circuit module or a brake module.
- a modular structure can thus be achieved, errors being isolated at the component level, so that no error propagation can take place. Furthermore, by providing the data bus that connects the individual modules directly, the distance of the transmission of analog signals can be minimized, so that the effort for EMC immunity can be kept relatively low.
- Another advantage of the invention is that a safety-critical application of a brake - with and without the presence of a braking request - as a result of a fault in a computer, power electronics or an actuator with sensors is not possible.
- Fig. 1 is a schematic block diagram according to a first
- Embodiment 2 shows a schematic block diagram according to a second embodiment; 3 shows a schematic block diagram according to a third embodiment; Fig. 4 is a schematic block diagram according to a fourth
- FIG. 5 shows a schematic block diagram according to a fifth embodiment of the invention.
- the pedal module 1 shows a pedal module 1 with a schematically indicated brake pedal 2.
- the brake pedal 2 or the movement of the brake pedal 2 can be detected, for example, by means of a sensor system 3 which has three sensors. Two displacement sensors and one force sensor can be used.
- the output signals of this sensor system 3 are then fed to modules for converting signals from the sensor system 3 into digital signals. These modules can be, for example, two integrated analog / digital converters 4.
- the analog / digital converter 4 are coupled to a data bus 5.
- the driver brake request can be detected in the pedal module 1 via the corresponding sensor system 3.
- the sensor system 3 has a redundant and dissimilar structure. For example, the pedal travel and foot force are recorded.
- the analog signals from the sensor system 3 are converted locally into digital values and transmitted to the redundant data bus 5 without further processing. However, the transmitted data can be faulty.
- Data consolidation i.e. The detection of defective sensors or defective hardware and a determination of a brake setpoint based on the output signals of the sensor system 3 can now take place in a central module 6 in this embodiment, for example.
- the brake setpoint determined in the central module 6 can then be transmitted to the brake modules 7 via the data bus 5.
- the braking setpoint or the braking request is then transferred in the braking modules 7 into a target value of an application force, a braking torque and / or an equivalent quantity.
- the central module 6 can superimpose higher functions, such as ABS, TCS, etc., on the brake setpoint and thus change the brake setpoint, if necessary. Furthermore, the central module 6 can be designed to be fail-silent. In one In the event of a fault, the central module changes to a safe state so that it does not affect other components or the overall system. In this embodiment, the central module switches off when an error is detected.
- an emergency operation function is activated in which the generation of the brake setpoint is carried out in each brake module 7. All that is necessary for this is the evaluation of a sensor signal from sensor system 3. For physical reasons (resolution, noise, etc.), however, it makes sense to evaluate more than one sensor. However, the redundant sensors are not monitored in the emergency operation function in the brake modules 7.
- the brake setpoint is determined in this brake module 7 from the sensor signals and transmitted to the other brake module 7 via the data bus 5. If a brake module 7 fails, the intact brake module 7 takes over the calculation of the brake setpoint. However, the brake module 7 without the implemented higher function does not carry out data consolidation and error detection.
- FIGS. 1 and 2 show four actuators 8, which can exert a braking force on one wheel 9 each.
- the actuators 8 are, for example, electric motors that press the brake linings against a brake disc of the wheel 9. Furthermore, it is shown in FIGS. 1 and 2 that two power supplies Bat 1, Bat 2 are provided, a power supply for a brake module 7 being provided in each case. This ensures that if a power supply fails, a brake module 7 can still be safely supplied with power. The same applies to the analog / digital converter 4.
- the brake modules 7 are fail-safe.
- the power electronics, the actuators, the sensors of the actuator and the computer of the brake module 7 are compared with reality, for example, by means of computer models.
- a previously stored table could of course also be provided, with which the brake measured values are monitored, in which case an error of the brake module 7 is concluded in the event of a deviation from the model idea or the values stored in the table from the measured variables can be.
- the brake module 7 then changes to a safe state.
- the brake is then released and thus only opens or only slides on the brake disc of the wheel 9.
- the fail-safe design of the brake module 7 can thus be achieved by hardware redundancy and analytical redundancy (software redundancy).
- the brake modules 7 each contain a device for the time-synchronous detection of wheel speeds.
- the wheel speeds are fed into the data bus 5 and led to the component or element that performs the higher functions.
- the brake modules 7 have a common time base.
- 3 shows a further embodiment of the invention.
- the driver's braking request is detected in FIG. 3 with a suitable sensor system 3.
- the sensor system 3 can consist of redundant sensors that record, for example, the pedal travel and the foot force. These analog signals are in turn converted locally into digital values.
- the data consolidation, ie the detection of defective sensors or defective hardware and the brake setpoint determination is now carried out in pedal module computers 10.
- the pedal module 1 is thus designed to be fault-tolerant.
- the fault-tolerant system outputs a consolidated signal, assuming that the consolidated signal (ie the braking setpoint, for example) is correct. If a fault of a sensor of the sensor system 3 is detected, the fault-tolerant pedal module 1 can be reconfigured, in which case the same function as before can be carried out without a loss of function.
- the consolidated brake setpoint is then transmitted to the central module 6, possibly modified by higher functions (ABS, ASR, etc.) and then transmitted to the brake modules 7.
- the brake modules 7 then use the brake setpoint to output an application force, a braking torque or equivalent quantities, the actuators 8 then being actuated accordingly. If the central module 6 fails, the system switches to an emergency function. The same applies if the central module function is implemented in a brake module 7.
- the brake setpoint in each brake module 7 is converted directly into a corresponding setpoint of the application force, the braking torque, etc. in this embodiment. If the higher functions are implemented in a brake module 7 (FIG. 4), the brake request is modified in this brake module 7 and transmitted via data bus 5 to the other brake module 7 as a modified brake setpoint. This modified brake setpoint is then used in turn to determine and output a corresponding application force, a braking torque or an equivalent quantity. If a brake module 7 fails, the intact brake module 7 takes over the determination of the application force of the braking torque or the equivalent quantities.
- the structure of the pedal module 1 is of redundant design. At least three computers can be provided so that the generation of the brake setpoint is fault-tolerant.
- a computer structure of the pedal module computer 10 is shown in FIGS. 3 and 4, which has two redundant computers in a duo / duplex structure.
- the computer of the pedal module 1 consists of four computers (Rl, Rl ', R2, R2'), two of which are combined to form an intrinsically safe (fail-silent) structure.
- a consolidated driver brake request is determined for each pair of computers and sent to data bus 5. If a calculation error occurs, the affected redundant computer switches off, i.e. either an error-free or no braking setpoint is output. It would also be conceivable to use a triple computer with a downstream voter / monitor. With this structure, only a consolidated brake setpoint would be output.
- the central module 6 or the control unit contains the above-mentioned higher functions and, in the case of the non-self-assured pedal module 1, determines the brake setpoint. Furthermore, the central module 6 guides in the case of the non-fault-tolerant or non-self-confident pedal module
- the central module computer 11 is redundant and switches itself off in the event of an error.
- the central module 6 then either behaves silently (fail-silent) or issues a message about its failure in order to bring the entire system into a safe state (fail-safe). An incorrect value is not output.
- a brake module 7 figures
- the brake module 7 consists of a redundant brake module computer 13 (Rl, Rl '), the power electronics for two actuators 8 and a redundant or cyclically testable shutdown unit 14.
- the actuator-specific sensor signals eg current, voltage, position, temperature, etc. are the Brake module 7 or the brake module computer 13 supplied.
- the shutdown unit 14 is separated from the power electronics for safety reasons, ie a fault in the power electronics does not influence the function of the shutdown.
- the redundant computer structure ensures that the shutdown command is executed correctly locally in the event of a shutdown command from the central module 6 or an error in the brake module 7. A separate switch-off line from the central module 6 can be saved by this structure.
- the redundancy interface is fail-safe, ie the brake module 7 fulfills its specific function or switches itself off in the event of an error and reports the malfunction or is silent in the event of a computer error.
- the fail-safe structure ensures that an error is recognized and the actuator 8 can be switched off.
- redundant computers with the properties fail-silent or fail-safe can be constructed, for example, by two complete, parallel computers with the same or dissimilar structure. It would also be possible to use a double computer with core redundancy. Similar structures would also be possible for a fault-tolerant triple computer. With the triple computer, however, a fault-tolerant voter / monitor would be required instead of a comparator (two-computer concept).
- the data bus 5 is double and connected to each module. A reduced double bus 5 can be used for cost reasons.
- the second bus to the central module 6 and a brake module could be saved.
- the data bus 7 can be a CAN (Controller Area Network) bus with an event-oriented data transmission.
- a TTP Time Triggered Protocol
- TTP Time Triggered Protocol
- a central and synchronous detection of the wheel speeds can take place in the central module 6 or in a brake module 7. If the wheel speeds are recorded and processed separately and the bus transmission is carried out, the detection must take place in the brake modules 7 in a time-synchronized manner. This is easy to implement, for example, when using a TTB bus. With the CAN bus, more effort is required to achieve the necessary synchronicity.
- At least two independent supply sources are required as energy supply (Bat 1, Bat 2).
- the inventive provision of two actuators 8 in a brake module 7 results in a degradation comparable to the hydraulic brake in the event of a fault. If one brake module 7 or a power supply fails, two fall Brakes 8, 9 out. This means that there can be a circle failure. If the higher functions are implemented in the brake module 7 concerned (cf. FIGS. 2 and 4), they also fail. This can be tolerated, since higher functions are no longer required in the event of a circuit failure. Otherwise, only one wheel brake is affected in the event of a fault in an actuator 8 and the associated power unit and the sensors. If the central module 6 fails, the higher functions also fail (see FIGS. 1 and 3), the full edge braking function being retained. A bus failure does not result in degradation (except when using the aforementioned reduced double bus).
- the system architecture according to the invention ensures that no error propagation occurs. According to the invention, an error is recognized before it can affect other functions or modules. Furthermore, the connections are reduced and the communication effort is minimal in the event of an error. For the propagation of errors and the effort for error detection, it is irrelevant whether the function driver request detection (brake setpoint determination) and error detection of the pedal sensors are processed in the pedal module 1 or in the central module 6.
- each brake module 7 is now equipped with a redundant computer 13, power electronics, an actuator 8 and the actuator-specific sensors (e.g. current, clamping force, position) and a redundant or cyclically testable shutdown unit 14 for the voltage supply to the actuator 8 Mistake.
- the redundant computer 13 now each provided for a wheel brake.
- the data bus can be of reduced design for cost reasons.
- the second bus to the brake modules 7 of the rear axle (HR, HL) and to the central module 6 can be saved.
- safety with regard to the braking function in the event of a fault is retained, since the connection between the pedal module 1 and the preferably front braking modules 7 (VR, VL) is double.
- VR, VL preferably front braking modules 7
- FIGS. 1 to 4 there is a loss of function in the event of a bus error in the single bus.
- this loss of function is tolerable.
- the loss of function is small. Only if one power supply fails (bike 1 or bike 2) do two brakes fail (circuit failure), otherwise only one wheel brake 7 is affected. If the central module 6 fails, only the higher functions (ABS, ASR, ESP, ...) are lost, the full basic braking function being retained. A bus failure does not result in degradation. In the case of a reduced double bus (as shown in FIG. 5), however, the central module 6 and the brake modules 7, which are assigned to the rear brakes (HR and HL), can fail in the event of a bus error.
- the architecture can be configured so that the rear brakes (HR and HL) are never available in the event of a fault. The system architecture ensures high braking deceleration in all failure cases. Furthermore, it should be noted that the functions and systems or modules according to the invention described above are included in any combination, alone or in their entirety, by the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Safety Devices In Control Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19751917 | 1997-11-22 | ||
DE19751916 | 1997-11-22 | ||
DE19751917 | 1997-11-22 | ||
DE19751916 | 1997-11-22 | ||
DE19832167 | 1998-07-17 | ||
DE19832167A DE19832167A1 (de) | 1997-11-22 | 1998-07-17 | Elektromechanisches Bremssystem |
PCT/EP1998/007471 WO1999026822A1 (de) | 1997-11-22 | 1998-11-20 | Elektromechanisches bremssystem |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1032518A1 true EP1032518A1 (de) | 2000-09-06 |
EP1032518B1 EP1032518B1 (de) | 2003-05-28 |
Family
ID=27217956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98965683A Revoked EP1032518B1 (de) | 1997-11-22 | 1998-11-20 | Elektromechanisches bremssystem |
Country Status (4)
Country | Link |
---|---|
US (1) | US6345225B1 (de) |
EP (1) | EP1032518B1 (de) |
JP (1) | JP2001523619A (de) |
WO (1) | WO1999026822A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9302656B2 (en) | 2004-12-09 | 2016-04-05 | Lucas Automotive Gmbh | Electromechanical parking brake device and electronic system for operating same |
WO2021197554A1 (de) * | 2020-04-01 | 2021-10-07 | Continental Teves Ag & Co. Ohg | Bremssystem |
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DE19826131A1 (de) * | 1998-06-12 | 1999-12-16 | Bosch Gmbh Robert | Elektrisches Bremssystem für ein Kraftfahrzeug |
DE19915253A1 (de) * | 1999-04-03 | 2000-10-05 | Bosch Gmbh Robert | Verfahren und Vorrichtung zum Betreiben eines verteilten Steuersystems in einem Fahrzeug |
DE19937159B4 (de) * | 1999-08-06 | 2019-03-21 | Robert Bosch Gmbh | Elektrisch gesteuertes Bremssystem |
DE19937156A1 (de) * | 1999-08-06 | 2001-02-08 | Bosch Gmbh Robert | Elektrisch gesteuertes, dezentrales Steuersystem in einem Fahrzeug |
JP4723706B2 (ja) * | 1999-09-02 | 2011-07-13 | トヨタ自動車株式会社 | 車両用電気制御システム |
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Also Published As
Publication number | Publication date |
---|---|
JP2001523619A (ja) | 2001-11-27 |
EP1032518B1 (de) | 2003-05-28 |
US6345225B1 (en) | 2002-02-05 |
WO1999026822A1 (de) | 1999-06-03 |
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